> Indeed, it makes everything harder. Have a look at ntfs in the kernel
> which has to cope with file system block sizes between 512 bytes and
> several hundred kiB (at least they are in powers of two thank
> goodness...). You end up not being able to use a lot of generic
> functions as you for example need to lock multiple pages which needs to
> be ordered correctly, etc... If you look at the latest -mm kernel, the
> ntfs driver there has file write(2) support for any cluster size and you
> will see an example of the multiple page locking problem solution there.
Any chance this will make it into common code? I also need it for my
filesystem driver (here: http://bobcopeland.com/karma/). So far I've
only done read side which is not too bad, but as you say writing makes
things complicated.
That, and the extent-supporting mpage_readpages would make me a happy person.
-Bob
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